The present disclosure relates to louvers for enabling an air passage between an outside and an inside. More particularly, the present disclosure relates to louvers enabling said air passage while minimizing rain ingress towards an interior and minimizing noise produced in the interior. The present disclosure further relates to wind turbines including said louvers.

Modular air handling systems are presented including: at least one blade, where the at least one blade includes: an intake section for receiving an airflow including: an intake air portion, a filter portion, a coil portion, and a head portion; a removable fan module, where the removable fan module includes: at least one low velocity axial fan; and an isolation damper; a discharge section for discharging the airflow including: a discharge air portion; and a number of sensors for receiving process data, discharge data, and environmental data; and a control system for processing data from the number of sensors to provide a closed loop control of the modular air handling system, where each blade operates independently, and where the at least one low velocity axial fan for each removable fan module are controlled by a single control signal.

A modular fan housing configured to hold an array of motors and fans is provided. The modular fan housing is configured for use in an air-handling system that delivers air to a ventilation system for at least a portion of a building. The fan housing comprises a plurality of modular units configured to be stacked adjacent to one another in at least one row or column to form an array. The modular units each include an interior surface and have a front end and a back end that define a chamber. The chambers are configured to receive the motors and fans. Sound attenuation layers extend along at least a portion of the interior surface of the corresponding chambers. The sound attenuation layers are positioned between at least some of the adjacent chambers.

Fabric silencers for air ducts are disclosed. An example air duct silencer system includes an inner tube being of a first pliable material, the inner tube defining an airway extending along the inner tube. The example air duct silencer system further includes an outer tube being of a second pliable material, the outer tube to encircle the inner tube to define an annular space between the outer tube and the inner tube. The example air duct silencer system also includes a sound absorbing material to be disposed within the annular space.

A sound enclosure of a compressor to attenuate an operational sound level of the compressor is disclosed. The sound enclosure may be configured to generally enclose the compressor and attenuate radiantly emitted sound by the compressor. The sound enclosure may be configured to include a plurality of assembly sections, particularly two side sections and one bottom section, where the two side sections can be joined together like two halves of a clam shell and joined to the bottom section to facilitate easy assembly. The sound enclosure may form openings at longitudinal ends of the sound enclosure to accommodate refrigerant lines. The assembly sections of the sound enclosure may include one or more openings to accommodate a junction box, wire bundles, oil lines, mounting mechanisms, etc.

An air conduction part for conducting a compressible medium, which part has a cross section through which the medium passes in a flow direction of the medium when the air conduction part is used, which flow direction approximately corresponds to a longitudinal axis of the air conduction part, the air conduction part including at least one wall arrangement that laterally defines the cross section of the air conduction part and conducts the medium. The wall arrangement are provided with at least one shell and with at least one damping device that removes sound energy from the medium, and the shell and the damping device are integrally interconnected so that, with a justifiable amount of outlay, the resulting air conduction parts effectively damp sound and the transport direction of the medium and/or the cross section of the air conduction part may change.

A sound attenuating baffle mounts within the duct section of an air distribution HVAC system, a ventilation system, or other air movement system for either air or gas streams, in which the duct section can be mounted directly to a fan or incorporated into a transmission duct. The sound attenuating baffle is typically oriented in the flow direction through the duct, and includes an outer casing containing sound absorbing material therein. An internal mass layer formed of a sound barrier material is suspended within the sound absorbing material which fills the outer casing. The mass layer increases the low frequency sound attenuation of the sound attenuating baffle.

There is disclosed an outdoor unit an outdoor unit that may attach a cover to a case by using a magnetic member and have an empty space formed between the case and the cover as large as the thickness of the magnetic member, wherein air or a sound-proof or meta material may be filled in the empty space and a cover for covering the case of the outdoor unit may include several pieces that are detachably connected with each other like Lego pieces, and the cover may be attached to the other area of an outer surface of the outdoor unit except the area having an inlet for sucking external air and an outlet hole for discharging the external air drawn into the outdoor unit via the inlet outside again.

A ventilation device 21 configured to be connected to a mouth of a ventilation duct 9 between the ventilation duct and an outside space. The ventilation device comprises an airflow opening 27 for passage of an airflow 30 between the ventilation device and the outside space. An air-permeable material 29 is arranged in the airflow opening 27.

A temperature control (“TC”) unit and associated method for providing simultaneous independent temperature control of conditioned air to first and second rooms. The TC unit includes a cabinet. The cabinet may be divided into first and second compartments, the first compartment being adapted to receive and exhaust air from and to, respectively, the first room, and the second compartment being adapted to receive and exhaust air from and to, respectively, the second room. Sound dampening insulation may be positioned between the first and second compartments. First and second evaporators may be positioned within the cabinet so that: air from the first room passes through the first evaporator before exhausting back to the first room; and air from the second room passes through the second evaporator before exhausting back to the second room. The TC unit may be or include a vertical terminal air conditioning (“VTAC”) unit.